1. Faculty of Psychology and Educational Sciences, KU Leuven , Leuven , Belgium
2. Department of Pediatric Hemato-Oncology, University Hospitals Leuven , Leuven , Belgium
3. Department of Oncology, Pediatric Oncology, KU Leuven , Leuven , Belgium
4. Faculty of Medicine and Health Sciences (CAPRI), University of Antwerp , Antwerp , Belgium
5. Department of Public Health and Primary Care, KU Leuven , Leuven , Belgium
6. Institute of Health and Care Sciences, University of Gothenburg , Gothenburg , Sweden
7. Department of Paediatrics and Child Health, University of Cape Town , Cape Town , South Africa
8. UNIBS, University of the Free State , Bloemfontein , South Africa